Presentation is loading. Please wait.

Presentation is loading. Please wait.

A picture of a person’s chromosomes.

Published byPearl Kelley Modified over 5 years ago

Similar presentations

Presentation on theme: "A picture of a person’s chromosomes."— Presentation transcript:

1 A picture of a person’s chromosomes.
Karyotypes A picture of a person’s chromosomes.

2 Karyotype A karyotype is an organized profile of an individuals chromosomes. The Chromosomes are identified, numbered and arranged from largest to smallest. Chromosomes can then be examined to identify genetic disorders.

3 Prenatal Genetic Testing
How are fetal cells obtained? 1. Amniocentesis

4 AMNIOCENTESIS A sample of amniotic fluid which contains fetal cells, is taken after the 14th week of pregnancy

5 2. CHORIONIC VILLUS SAMPLING
A sample of cells from the chorion (part of the placenta) is taken after the 9th Week of pregnancy

6 CHORIONIC VILLUS SAMPLING

7 HUMAN CHROMOSOMES ALL MIXED UP

8 NORMAL HUMAN KARYOTYPE

9 WHAT’S DIFFERENT? Examine the chromosomes. How does this karyotype differ from a normal karyotype?

10 DOWN’S SYNDROME KARYOTYPE
Three copies of chromosome #21

11 WHAT’S DIFFERENT?

12 TURNER’S SYNDROME Missing a sex chromosome.

13 WHAT’S DIFFERENT?

14 XXY SYNDROME An extra sex chromosome.

15 WHAT’S DIFFERENT?

16 XYY SYNDROME

17 ONE OF CHROMOSOME 7 HAS PART MISSING (DELETION)

18 Monosomy and Trisomy Monosomy – missing a chromosome
Trisomy – an extra chromosome

19 NON-DISJUNCTION The failure of chromosomes or tetrads to separate properly during anaphase is called non-disjunction. This results in the addition or deletion of a chromosome in a gamete.

20 If it happens in meiosis I, all the resulting cells will be affected
If it happens in meiosis I, all the resulting cells will be affected. If it happens in meiosis II, only half will be affected.

21 NON-DISJUNCTION If a gamete with an extra chromosome is fertilized by a normal gamete, the zygote will have an extra chromosome, called trisomy. If a gamete missing a chromosome is fertilized by a normal gamete, the zygote will have only one copy of a chromosome, called monosomy.

22 How does this happen? NONDISJUNCTION ANIMATION at MEIOSIS I

23 NONDISJUNCTION MEIOSIS II

24 WHAT’S DIFFERENT?

25 Changes in chromosome structure animation

Download ppt "A picture of a person’s chromosomes."

Similar presentations

Achondroplasia.

Achondroplasia.
Notes: Karyotypes s.

Notes: Karyotypes s.
12.4 MUTATIONS I. Kinds of Mutations

12.4 MUTATIONS I. Kinds of Mutations
Non-disjunction, Down’s syndrome, and karyotypes IB Topic 4.2.

Non-disjunction, Down’s syndrome, and karyotypes IB Topic 4.2.
11.3 CHROMOSOMES & HUMAN HEREDITY

11.3 CHROMOSOMES & HUMAN HEREDITY
Karyotypes.

Karyotypes.
1copyright cmassengale. Aorganized picture arranged in pairs by size An organized picture of the chromosomes of a human arranged in pairs by size from.

1copyright cmassengale. Aorganized picture arranged in pairs by size An organized picture of the chromosomes of a human arranged in pairs by size from.
Genetic Disorders A disease caused by a different form of a gene called a variation, or an alteration of a gene called a mutation.

Genetic Disorders A disease caused by a different form of a gene called a variation, or an alteration of a gene called a mutation.
KARYOTYPING Honors Biology. What and How? Used as a way to “see” the chromosomes Pairs up homologous chromosomes Allows for detection of several genetic.

KARYOTYPING Honors Biology. What and How? Used as a way to “see” the chromosomes Pairs up homologous chromosomes Allows for detection of several genetic.
Learning Targets “I Can…”

Learning Targets “I Can…”
Human Female Karyotype

Human Female Karyotype
4.2.4 – 4.3.1 Non-disjunction, karyotyping, chorionic villus sampling, amniocentesis, theoretical genetics Tyler and Tahjai.

4.2.4 – Non-disjunction, karyotyping, chorionic villus sampling, amniocentesis, theoretical genetics Tyler and Tahjai.
Karyotypes and Pedigrees

Karyotypes and Pedigrees
Karyotypes Objective: E6 - Describe how techniques such as chromosomal analysis (karyotypes) are used to study the genome of organisms.

Karyotypes Objective: E6 - Describe how techniques such as chromosomal analysis (karyotypes) are used to study the genome of organisms.
Meiosis IB Topics 4.2 and 10.2 Chapter 13 Campbell.

Meiosis IB Topics 4.2 and 10.2 Chapter 13 Campbell.
Mistakes in Meiosis. Non-Disjunction a type of mistake in meiosis that happens to the CHROMOSOME It is the failure of homologous chromosomes to separate.

Mistakes in Meiosis. Non-Disjunction a type of mistake in meiosis that happens to the CHROMOSOME It is the failure of homologous chromosomes to separate.
2 Genetic Disorders  Clinical health problems visible at birth are called congenital defects  They are caused by mutations in genes or environmental.

2 Genetic Disorders  Clinical health problems visible at birth are called congenital defects  They are caused by mutations in genes or environmental.
Karyotyping. Fertilization spermeggzygote The fusion of a sperm and egg to form a zygote. A zygote is a fertilized egg n=23 egg sperm n=23 2n=46 zygote.

Karyotyping. Fertilization spermeggzygote The fusion of a sperm and egg to form a zygote. A zygote is a fertilized egg n=23 egg sperm n=23 2n=46 zygote.
Karyotypes Different organisms have different numbers of chromosomes Autosomes: Any chromosome that is not a sex chromosome (X or Y chromosome) – Humans.

Karyotypes Different organisms have different numbers of chromosomes Autosomes: Any chromosome that is not a sex chromosome (X or Y chromosome) – Humans.
Wake-up #2 Brown eyes (B) is dominant to blue eyes (b). A blue eyed woman marries a man who is a carrier. They want to have blue eyed children. How much.

Wake-up #2 Brown eyes (B) is dominant to blue eyes (b). A blue eyed woman marries a man who is a carrier. They want to have blue eyed children. How much.

Similar presentations

Ads by Google